Shock absorber



wl' KELLER SHOCK ABSORBER Aug. 24, 1926.

Filed July is, 1925 INVENTOR WKeLlez.

ATTORNEY Patented Aug. 24, 1926.

UNITED STATES PATE-NT oFFlcE.

WILLIAM KELLER, F HANCOCK, M1CE1G'AN'.A

SHOCK ABSORBER.

Application led July 13, 1925. Serial 1510. 43,091.

matically preventing excessive bounding of the body or reactionthereofas transmitted from the springs.

A further object is lto interpose a pneumatic cushion between thesprings and chassis frame to equalize the effects of the s ringsuniformlyon each side of the vehicle, tendin to maintainthe body level.

Another o ject is to provide relief valves manually operated to admitair whereby a `constant supply ismaintained to operate the device.

Theseand 'other like Iobjects are secured by the novel construction andarrangement of parts hereinafter described and shown in the accompanyingdrawing, forming an essential 4part of -this disclosure, and in Figure 1is a partial rear end 'elevational view of a conventional type'ofvehicle, showing an embodiment of the invention as applied.l Figure 2 isa sectional view of the same, the section being taken on hne 2-2 ofFigurel. i t Figure 3 is an enlargedv longitudinal sectional view takenon line 3-3 ofv Figure Referring more in detail to the drawing, thenumeral 10 designates the rear wheels mounted on an axle 11havingstirrups 12 carrying leaf springs 13.

' A body 14 rests upon a chassis having longitudinal side beams 15supported by the springs in the manner now to be described. Bolted .tothe ends of the beams 15 are exf tensions 16 terminating'in forks 17-throughAv 4 which ass .pivot screws- 18, threaded into bosses ormed onopposite sides of cylinders 19 arranged substantially verticalandprovided with caps 20 and 21- respectively at their upper and'lowerends. Thecap. 20 containsv `an inlet valve 22 normally closed by aspring 23 and is provided with a removable cover 24 permitting access tothe valve when air is allowed in or out of the cylinders 19. l a vExtending laterally outward from the -cap is a hollow projection 25engaged by a union connector 26 with a pipe 27 leading to the chassisside members, e(pistons close fitting opposite side of the vehicle'which`is provided with siini1arbut oppositely Adisposed elements. 55

The lower cap 21 isfurnished with a central opening through whichpassesa rod 28 connected by a pin 2 9 to an eye 30 in the end of a leafspring13.

A packing ring 31 isitted in a recess in 60 the end Iof the cap 21, thesame being held in place around the rod 28 by a nut 32.

A hollow projection 33, similar to the corresponding element 25, isprovided with a union 34 to connect the pipe 35, communieating with thecylinder at the opposite side of the vehicle. l

Pistons 36, fixed on the rods 28 operate in the cylinders 19, snuglyfitting the same and compressing the air in their upper ends to' 70 theextent of supporting the weight of the vehicle, the weight being equallydistributed on each side, and as the -cylinders are in communication,this is- 'readily accomplished.

In order to prevent rebound, air is ad- -mitted tothe cylinders belowthe pistons by the inlet valves 37, the same being normally springpressed to their seats and provided with covers 38, removable .when airunder compression is entered. a

From the foregoing description the operation will be understood and theadvantages of its use be obvious.

Having thus described my invention .and set'for-th the manner of itsconstruction and application, what I claim as new and desire to secureby Letters Patent, is z' `1. A shock absorbing device for vehiclescomprising in combination with thesprings and chassis frame thereof, ofa. pair of cylinders havingcaps at their ends, forked su ports pivotallyengagiing said cylinders, said supports being x on the ends of Athe saidcylinders, rods iix in said pistons, the lower'ends .of said rods beinpivotally engaged with the ends of sai springs, and pi es communicatingbetween the pairs of cy inders respectively. above and be 10 ow saidpistons.

`2. A shock absorbing device for vehicles comprising in combinationlwith the springs and chassis frame thereof, of a `pair of cylindershaving caps at their ends, forked supports pivotally engaging saidcylinders, said supports being fixed on the ends of the chassis sidemembers, pistons close fitting 5 said cylinders, rods fixed in saidPistons, the

lower ends of said rods being plvotally en- 'gaged with the ends of saidsprings, means for admitting air to said cylinders above andbelow saidpistons,and means of communication between said cylinders at theirrespective ends.

In witness whereof I have 'aixed my signature. WILLIAM KELLER.

